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GMRTELAIN2 - Giant Metrewave Radio Telescope ELAIS-N2 Field 610-MHz Radio Source Catalog

HEASARC
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Overview

This table contains a source catalog based on observations of the European Large-Area ISO Survey-North 2 (ELAIS-N2) field taken at 610 MHz with the Giant Metrewave Radio Telescope (GMRT). Thirteen pointings were observed, covering a total area of ~ 6 square degrees with a resolution of 6.5 x 5 arcsec2, position angle of +70 degrees. The rms noise at the center of the pointings is typically ~ 85 microJansky (uJy) before correction for the GMRT primary beam . The techniques used for data reduction and production of a mosaicked image of the region are described in the reference paper, where the final mosaic, along with a catalog of 1310 sources detected above a 6-sigma threshold, are presented. The survey complements existing radio and infrared data that are available for this region. For further details of the surveys and data analysis procedures, please refer to the published paper.

This table contains the ELAIS-N2 catalog of 1310 detected 610-MHz radio sources.


Catalog Bibcode

2009MNRAS.397.1101G

References

The relationship between star formation rate and radio synchrotron luminosity
at 0 < z < 2
    Garn T., Green D.A., Riley J. M., Alexander P.
    <Mon. Not. R. Astron. Soc. 397, 1101 (2009)>
    =2009MNRAS.397.1101G       (SIMBAD/NED BIBCODE)

Provenance

This table was created by the HEASARC in February 2012 based the source catalog of the Cambridge GMRT Survey of the ELAIS-N2 region which was obtained from the University of Cambridge Astrophysics Group Surveys and Catalogs website at http://www.mrao.cam.ac.uk/surveys/GMRT/ELAIS-N2/ file GMRT_EN2_dr1.dat.

Parameters

Name
The name of the radio source using the IAU-style designation for the source based on the truncated J2000.0 equatorial coordinates of its centroid, viz., 'GMRTEN2 JHHMMSS.s+DDMMSS', where the GMRTEN2 prefix stands for 'Giant Metrewave Radio Telescope ELAIS-N2'. This naming convention has not been registered with the CDS Dictionary of Nomenclature of Celestial Objects, notice, but has been adopted by the HEASARC in analogy with the names used for the Giant Metrewave Radio Telescope ELAIS-N1 Catalog by the same authors (these were 'GMRTEN1 JHHMMSS.s+DDMMSS').

RA
The Right Ascension of the source in the selected equinox, calculated using first moments of the relevant pixel brightnesses to give the centroid position. This was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the source in the selected equinox, calculated using first moments of the relevant pixel brightnesses to give the centroid position. This was given in J2000.0 coordinates to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the radio source centroid.

BII
The Galactic Latitude of the radio source centroid.

Flux_610_MHz
The radio brightness of the peak pixel in the 610-MHz radio source, in mJy/beam.

RMS_610_MHz
The local rms noise near the source position, in mJy/beam (converted by the HEASARC from the uJy/beam units used in the original table).

Int_Flux_610_MHz
The integrated flux density of the 610-MHz radio source, in mJy.

Int_Flux_610_MHz_Error
The error in the integrated flux density of the 610-MHz radio source, in mJy.

Centroid_X_Pixel
The X pixel coordinate from the mosaic image which was closest to the source centroid.

Centroid_Y_Pixel
The Y pixel coordinate from the mosaic image which was closest to the source centroid.

SExtractor_DB_Flag
The SEXTRACTOR (Source Extractor) deblended object flag coded as follows:

     1 = where a nearby bright source may be affecting the calculated flux
     2 = where a source has been deblended into two or more components
         from a single initial 'island' of flux
     3 = when both conditions 1 and 2 apply
  
There are 57 sources present in the catalog with non-zero deblend flags, and it is necessary to examine the GMRT mosaic image, available at http://www.mrao.cam.ac.uk/surveys/GMRT/ELAIS-N2/, to distinguish between the case where one extended object has been represented by 2 or more entries, compared to the case where two astronomically different objects are actually present.

Contact Person

Questions regarding the GMRTELAIN2 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 9-Feb-2012